Best 4 Inch Furnace Filters

For a loose frame of reference refer to this chart.

Best 4 inch furnace filters.

Most filters are one inch thick but some are two or even four inches thick. The 4 inch thick aprilaire healthy home 213 merv 13 earns an excellent rating for removing dust smoke and pollen when the hvac system is running on its highest fan speed. If your hvac system uses a thicker filter usually in the 4 to 5 inch range and usually mounted at the air handler it was likely designed specifically for medium efficiency merv filtration. If your existing filter is one inch thick a four inch filter isn t going to fit without serious modifications to your system.

An inexpensive merv 4 filter captures 80 percent of the particles 50 microns and larger but only 25 percent of the particles in the 3 to 10 micron range. In our tests we found that the thicker the filter the better it works and the longer the. For more than 50 years furnace filters were made from fiberglass and some people prefer to stick with these types of filters. Sold in both 4 and 5 inch sizes this deep pleated filter has some unique qualities for one thing the filtrete micro allergen filter can trap air particles as small as 0 3 microns.

1 3 months. 6 9 months. Airx health 20x25x1 merv 13 pleated air filter made in the usa box of 6. Bestair pfhw1625 11cr ac furnace air filter 16 x 25 x 4 merv 11 removes allergens contaminants carbon infused to eliminate odor fits 100 for honeywell models 4 8 out of 5 stars 29 24x24x4 merv 8 ac furnace 4 inch air filters.

Honeywell fc100a1037 ultra efficiency 4 furnace filters. Nordic pure 4 furnace filters. Finding the best hvac air filters for home. Thicker filters don t have to be changed as often such as 6 inch filters which can last between 9 to 12 months before they need to be replaced.

Most air filters are 1 inch thick but some systems can accommodate filters 2 to 5 inches thick. 1 3 months. It also has an electrostatic technology that reduces the most common types of household allergies such as dust lint mold spores pet dander pollen smog and dust mite debris. So here is my list of the 10 best furnace filters.

In theory a thicker filter gives greater filtration but they aren t interchangeable. One top rated option in this category is the flanders precisionaire nested fiberglass filters which are incredibly affordable. 6 9 months.